Search for a narrow resonance decaying to a pair of muons in proton-proton collisions at 13 TeV
/CMS Collaboration
A search is presented for a narrow resonance decaying to a pair of muons using 13 TeV proton-proton collision data recorded by the CMS experiment at the CERN LHC. The search in the $45-75$ and $110-200$ GeV resonance mass ranges uses fully reconstructed event data, corresponding to an integrated luminosity of 137 fb$^{-1}$. [...] CMS-PAS-EXO-19-018.-
Geneva : CERN, 2019Figure_001:PDF; Figure_002:PDF; Figure_003:PDF; Fulltext in PDF:PDF;

Observation of the $\Lambda_{\mathrm{b}} \to \mathrm{J}/\psi \Lambda \phi$ decay in proton-proton collisions at $\sqrt{s}=$ 13 TeV
/CMS Collaboration
We report a first observation of the $\Lambda_{\mathrm{b}} \to \mathrm{J}/\psi \Lambda \phi$ decay using proton-proton collision data collected at $\sqrt{s}$= 13 TeV by the CMS experiment at the LHC, and corresponding to an integrated luminosity of 60 $\mathrm{fb}^{-1}$. The ratio of the branching fractions ${\cal B}(\Lambda_{\mathrm{b}} \to \mathrm{J}/\psi \Lambda \phi)/{\cal B}(\Lambda_{\mathrm{b}}\to \psi\mathrm{(2S)} \Lambda)$ is measured to be $(8.26\pm0.90~\mathrm{(stat)} \pm0.68~\mathrm{(syst)}\pm0.11({\cal B}))\times 10^{-2}$, where the first uncertainty is statistical, the second is systematic, and the third is due to the uncertainties in the world-average branching fractions..CMS-PAS-BPH-19-002.-
Geneva : CERN, 2019Figure_001-a:PDF; Figure_001-b:PDF; Figure_002:PDF; Fulltext in PDF:PDF;

Measurement of the cross section for $\mathrm{t}\bar{\mathrm{t}}$ production with additional jets and b jets in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$
/CMS Collaboration
The cross sections of top quark pair production in association with a pair of jets from bottom quarks ($\sigma_{\mathrm{t}\bar{\mathrm{t}}\mathrm{b}\bar{\mathrm{b}}}$) and in association with a pair of jets from quarks with any flavor or gluons ($\sigma_{\mathrm{t}\bar{\mathrm{t}}\mathrm{jj}}$) and their ratio are measured in proton-proton collisions at a center-of-mass energy of $13~\mathrm{TeV}$ with data collected in 2016 by the CMS detector at the LHC, corresponding to an integrated luminosity of $35.9~\mathrm{fb}^{-1}$. The measurements are performed in the visible phase space in the dilepton and lepton+jets channels separately, by fitting the distribution of the b tagging discriminant variable of the two jets that do not belong to the $\mathrm{t}\bar{\mathrm{t}}$ decay. [...] CMS-PAS-TOP-18-002.-
Geneva : CERN, 2019Figure_001-a:PDF; Figure_001-b:PDF; Figure_001-c:PDF; Figure_001-d:PDF; Figure_002-a:PDF; Figure_002-b:PDF; Figure_002-c:PDF; Figure_002-d:PDF; Figure_003-a:PDF; Figure_003-b:PDF; Figure_004-a:PDF; Figure_004-b:PDF; Figure_005:PDF; Figure_006:PDF; Fulltext in PDF:PDF;

First measurement of the running of the top quark mass
/CMS Collaboration
The first measurement of the running of the top quark mass is presented. The mass of the top quark in the modified minimal subtraction renormalization scheme is extracted from the differential $\mathrm{t\bar{t}}$ cross section as a function of the invariant mass of the $\mathrm{t\bar{t}}$ system via a $\chi^2$ fit to next-to-leading-order differential theory predictions. [...] CMS-PAS-TOP-19-007.-
Geneva : CERN, 2019Figure_001:PDF; Figure_002-a:PDF; Figure_002-b:PDF; Fulltext in PDF:PDF;